### Assignment Set-2

 Computer Organization and Architecture 1. Give the details of data types specified for VAX & IBM 370 machines.Answer:2. Discuss various number representations in a computer system.Answer:3. Explain the addition of two floating point numbers with examples.Answer:4. Discuss the organization of main memory.Answer:5. Explain various replacement algorithms.Answer:6. Discuss the different categories of instructions.Answer:7. Explain various operations of ALU.Answer:8. Discuss the different formats of floating point numbers.Answer:9. Explain the characteristics of memory system.Answer:10. Discuss the physical characteristics of DISK.Answer:For answers, refer to Course Material========================================================Discrete Mathematics 1. Prove that a finite integral domain is a field.Answer: here or here2. Prove that in a ring R Answer: (i) Since 0= 0+0, we have a.0=a(0+0)=a.0 + a.0. Adding –(a.0) to both sides yields 0=a.0. Similarly, 0.a=0.(ii)     For given element a, suppose element x has the property that a+x=0 [ which automatically makes x+a=0]. We have:                            -a=-a+0=-a+(a+x)=(-a+a)+x=0+x=x                  as                            ab + a(-b)= a(b+(-b))=a.0=0; hence a(-b)= -ab.           Similarly (-a)b=-ab. (iii)         a+(-1)a=1.a+(-1)a=(1+(-1))a=0.a=0         hence from (ii):                     (-1)a=-a 3. Let p be “It is cold” and let q be “It is raining”. Give a simple verbal sentence which describes each of the following statements       (a) ~p    (b) p^q  (c) pv q  (d) qv ~pAnswer:(a). It is not cold(b). It is cold and raining(c). It is cold or it is raining.(d). It is raining or it is not cold4. In a survey of 60 people, it was found that                25 read News week Magazine               26 read Time               26 read Fortune               9 read both News week and Fortune               11 read both News week and Time               8 read both Time and Fortune               3 read all the three magazines.    (a) Find the number of people who read atleast one of the three magazines?    (b) Find the number of people who read exactly one magazine?Answer:(a). 52(b). 305. Let A = {1, 2, 3, 4, 6} and let R be the relation on A, defined by “x divides y”, written as          (a) Write R as a set of ordered pairs.       (b) Draw its directed graph.       (c) Find the inverse relation R-1 of R. Can R–1 be described in words? Answer:(a). R = {(1,1), (1,2), (1,3), (1,4), (1,6), (2,2), (2,4), (2,6), (3,3), (3,6), (4,4), (6,6)} (b). just draw the directed graph of R ( from (a) )(c). R-1 = {(1,1), (2,1), (3,1), (4,1), (6,1), (2,2), (4,2), (6,2), (3,3), (6,3), (4,4), (6,6)} Answer: ========================================================Operating Systems 1. Explain how virtual addresses are mapped on to physical addresses.Answer:2. Discuss the Optimal Page Replacement algorithm.Answer:3. Explain the concept of File.Answer:4. Explain the execution of RPC.Answer:5. Write a note on computer virus.Answer:6. Explain first-fit, best-fit and worst-fit allocation algorithms with an example.Answer:7. Explain demand paging virtual memory system.Answer:8. Explain different operations possible on Files.Answer:9. Explain how applications and data can be distributed.Answer:10. How the protection is implemented using the concept of domains?Answer:For answers, refer to Course Material========================================================Technical Communication 1.  Choose a 150 word passage from a technical article addressed to an expert audience.  (You can choose this from any              journal or web) Rewrite the passage so that it is clear and interesting to the general reader.Answer:2.  Write a short note on the strength and weaknesses of Systems  Development Life Cycle.Answer:3.  Write a note on plagiarism as an ethical issue in technical journalism. Answer:4.  Rewrite the following passages to make them simple, concise and effective.   i)    It is understandable that your highly respected firm is exceedingly anxious to secure the valuable services of competent young men who have undergone specialized and detailed training in the outstanding educational institutions of our day – and let me say in a patriotic aside, our noteworthy institutions are indeed comparable in prowess and achievement and dignity to the most heralded universities and colleges of any nation – and thus it is my earnest conviction that when you go far afield in search of promising prospects for your dominant organizations, you will proceed eventually to the hallowed college from which I send forth this missive. ii)    Past experiences show that the Internal Revenue Service would take action to disallow the claiming of the tax benefits resulting from the use of multiple corporations in so far as they are established primarily for that purposeAnswer:5.    Convert the following sentences from active into passive         i)    It was decided that the number of stipends to poor students may be increased (by the Staff Council)        ii)   A vigorous literacy drive has been launched by the ladies of this town.        iii)  If hospitals are not to become human rights wastelands, action must be taken by patients to protect their rights.        iv)  The most important thing is that reliable maintenance is necessary for operations of an airline to be efficient.         v)   Meal prices are also affected by the increase in employees.Answer:=========================================================Computer Networks 1. Define the term routing.  Differentiate static and dynamic routing.Answer:2. Differentiate IPv4 and IPv6 addressing schemes.Answer:3. Describe the following:     a.  Congestion     b.  Congestion ControlAnswer:4. Discuss the Remote Procedure Calls and their importance in Session Layer.Answer:5. Discuss Simple Mail Transfer Protocol in detail.Answer:6. Explain any two static routing algorithms.Answer:7. Discuss IPv4 addressing schemes.Answer:8. Discuss Congestion Avoidance in Transport Layer.Answer:9. Discuss various design issues of Session Layer.Answer:10. Describe the Multipurpose Internet Mail Extensions.Answer:For answers, refer to Course Material